Added new matches for recently-standardized property names, functions, and values.
I compared a few sources online and found the below page to be the best CSS3-inclusive list of property names (my PR adds all the values from this list not there before, and also "stroke" for SVG use):
For property values I manually pulled in recently-added keywords such as Flexbox-related values ("flex-end", "flex-start"..), background-size values ("cover", "contain"...), and function names for transforms (skew(), scale()...) and calc().
Added new matches for recently-standardized property names, functions, and values.
I compared a few sources online and found the below page to be the best CSS3-inclusive list of property names (my PR adds all the values from this list not there before, and also "stroke" for SVG use):
https://meiert.com/en/indices/css-properties/
For property values I manually pulled in recently-added keywords such as Flexbox-related values ("flex-end", "flex-start"..), background-size values ("cover", "contain"...), and function names for transforms (skew(), scale()...) and calc().